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-9t-4=-8t
We move all terms to the left:
-9t-4-(-8t)=0
We get rid of parentheses
-9t+8t-4=0
We add all the numbers together, and all the variables
-1t-4=0
We move all terms containing t to the left, all other terms to the right
-t=4
t=4/-1
t=-4
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